Now, three months after high school senior Damaris had no trouble getting over 50,000 retweets, Harbour has followed up on his pledge.

"Voted most likely to hijack someone's high school senior photos 24 years later," Harbour wrote in his caption on Instagram. "Many thanks to [Damaris] and her kind family and [Tommy Photography] for making a dream come true and proving my high school classmates right!!"

When INSIDER spoke with Harbour in October 2016, we asked about the Twitter storm surrounding his promise to Damaris.

"The idea of me in a small size sweatshirt of some high school, holding a trombone with this poor girl trying to take her high school photos seriously, I just thought that was so funny," Harbour said.

Harbour truly stuck to his word, and wore a large sweatshirt from Orestimba High School in Newman, California. He's also posing with a trombone in most of the photos (though we spy one picture featuring Harbour and pom-poms instead).

As for Harbour, he's not easing off the social media any time soon. The platform gives him a cherished connection to his fans around the world.

"I have this weird relationship with Twitter where I'm sporadically on it," Harbour said. "So when the show drops, I find that the social media love for the show is so profound that I really do enjoy hearing what people have to say about it and engaging with them."